Wind Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
New snow and wind over the last 3 days has created unstable conditions. Wind loaded terrain in the middle and upper elevations are the most likely places to encounter unstable snow in the form of wind slabs 1-3 feet thick. In the lower elevations expect to encounter isolated pockets of unstable snow up to 1 foot thick in steep terrain. While wind slabs are the most likely type of avalanche to trigger, don’t rule out slabs unaffected by the wind. Continued snowfall, winds and warming throughout the day will increase the size and sensitivity of these slabs.
Remote triggers and wide propagation were noted yesterday. Expect more of the same today. When snow is behaving this way, it is time to dial back your terrain choices significantly. Avoiding convexities over 35 degrees will help to minimize the likelihood of triggering at your feet, board, skis or machine. In addition, it will be critical to be aware of terrain and other groups above. Recognize that avalanches may release in unusual places. Prepare to be surprised. Ensure your route choices allow for these surprises by allowing a wider buffer around terrain than usual.
(12/28/2024)
A widely propagated avalanche (500 feet across) observed south of Jackson Hole Mt Resort. SE Aspect at 9,300 feet. Red lines are all crown lines. the starting point is labeled in green at the top.
